Solidify blocks synchronously while they are processed #1761
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In case a client issues a block on top of solid parents, and he assumes that the resulting block also is solid, it happened that the node already processed the block, but didn't mark the block as solid yet. This causes problems in the client if they reuse the issued block in the next block as a parent immediately, because the submit might fail due to "block not solid" errors.
This PR fixes this race condition.